iStock/Thinkstock(MELBOURNE) — Multiple people have died in Melbourne, Australia, due to a thunderstorm asthma emergency this week.

A sixth person was confirmed dead Saturday, according to Australia’s ABC, and five patients remained in intensive care in Melbourne hospitals.

On Monday, a thunderstorm aggravated very high levels of rye grass pollen and created breathing problems for thousands in Melbourne.

Ambulance Victoria responded to more than 1,870 calls within a five-hour period on Monday, according to BBC, causing extended waiting times and limited emergency services.

Asthma Victoria chief Robin Ould said according to BBC that the rye particle count in Melbourne on Monday was more than double what was normally considered high.

“The key message of this event is that, if you have asthma, you should be using your preventative medication as described,” he said to BBC.

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